Steam boiler



Aprl 8, 1930. D. s. JAcoBus STEAM BOILER Filed new 19, 1924 2sheets-sheet 1 m #l z a n Z 7 0f? .M W

IVENTOR. v y

ATTORNEYS.

April 8, 1930. D. s. JAcoBus 1,753,267

STEAM BOILER Filed Dec. 19, 1924 2 she,e1;ssheet 2- IN V EN TOR.

- 1an(k 4 fffxm/ Patented Apr.` 8, 1930 4UNITED STATES la'xrizlal"OFFICE DAVID S. JACOBUS, OF JERSEY CITY, NEW JERSEY, .SSGNOR TO .THEBABCOOK @e WILGOX COMPANY, OF BAYONNE, NEW JERSEY, A CORPORATION OF NEWJERSEY STEAM BOILEE Application led December 19, 1924. Serial No.756,867.

My invention will best be understood by reference to the accompanyingdrawin s in which I have illustrated a preferred orm thereof and inwhich Fig. 1 is asectional view 5 taken through a steam boilerillustrating my invention; Fig. 2 is a fragmentary sectional viewillustrating the ends of certain tubes connected to a drum; Fig. 3 is aninver/ted plan view of Fig. 2 and Fig. 4 is a longitudinal section,through an end portion of a tube, made in accordance with my invention.

Like reference characters indicate like parts throughout the drawings.

Referring now to the drawings,'and first to Fig. 1, 10, 11 and 12 areupper transverse steam and water drums'of a steam boiler of the generalStirlin type, the drums 10 and 11 being connected y lsteam circulatingtubes 13 and water circulating tubes 14, while the drums 11 and 12 areconnected by steam circulating tubes 15. A lower mud drum v16 isconnected to the upper steam and water drums by banks of tubes 17,184and 19, res ectively,

baes 20,21 and 22 being provided or direct- 25 ing the gases from thefurnace chamber 23 in a plurality of passes over the boiler tubes in aknown manner, to an outlet flue 24. The

front and rear walls ofthe setting are inl dicated by the referencenumerals 231 and 232 respectively. I have illustrated the furnace asprovided with an ordinary grate 25.

Referring now more particularly to Figs. 2, 3 and 4, it will be seenthateach of the tubes 191, the inner as well as the outer diameters, arereduced at their ends, as at 192, it being understood that each of thetubes is also preferably reduced at its opposite end, as 1llustrated inFig. 1, by a swaging or other desired-operation.v The reduced ends of'the 40 tubes are expanded into the tube sheet, as at 26 in the usualmanner. The ends of the tubes are preferably curved as illustrated 1nFig. 1 and have strai ht-end portions reduced in diameter receive in theopenings of the drum. It is advantageous to make the re- .the oppositethe associated driim thereof, after tube is removeda suicient distancefrom the tube hole in which it is first inserted to make 'it come to itsproper position in the boiler.

duced end portions straightv as a special tube cleaner may be morereadily passed through the reduced portions of the tubes.

By 4reducing the diameter of the ends of the tubes, which'are connectedto lthe tube sheets in the described manner, the openings therein `aremade correspondingly smaller than they otherwise would be, therebyresulting in an increase inthe ligament efliciency of the tube sheet andrendering it possible to use a higher steam pressure in the boiler forthe same thickness of boiler plate thanwould otherwise be possible.Forexahiple, with a boiler plate two inches in thickness and with boilertubes three and one-quarter inches in diameter, the maximum pressureallowed for a' Stirling boiler is 420 pounds. By reducing `the outerdiameter of the tubes from three and one-quarter inches to two andonehalf inches, where they enter the tube sheet, the working pressurefor a twoinch thick plate may be made 560 pounds, and still maintainsubstantially the same heating surface that the boiler would have if thetubes were of uniform diameter throughout.

The tubes are reduced in external diameter vat one end at least, andpreferably at b oth vends, where they enter the drums suiiicient inextent lengthwise of the tubes to permit suilicient movement of oneofthe reduced ends lof a given tube through its opening in theassociated drum tov permit of the insertion of end of the tube in itsopening in the associated drum and its removal therefrom. When a tube isinstalled, one of the reducedends is passed through atube hole in theassociated drum a sui'icient` distance to bring the other end oppositeits'tube hole in It will be understood that in inserting, a tube, it isassed through one ofthe wider lanes piovided between each twocircumferential which the going manner.

rows of tubes. It will be noted from Figs. 1 and 2 that the tubes arereduced at their ends a distance lengthwise thereof sufficient to permitthe tubes to be installed in the fore- Furthermore, the curved ends ofthe tubes assist in inserting the tubes, as the tube can be held at anangle to its linal p position and twisted in inserting it through thefirst tube hole vwhen it is brought to a position Where the opposite endcomes opposite the second tube hole, and the installation can be madeWithout subjecting the metal surrounding the rst tube hole tosubstantial strains;

tive .drums in a plurality of circumferential and longitudinal rows, theportions of the drums entered by said tubes being of sub- Ystantiallyfunitorm thickness, each tube being reduced in externalvdiameter at one end at leastwhere it enters the drum suilicientin extentlengthwiseof the tube to permit suiiicient movement of the reduced endof thek tube through its opening in the associatedduced at theirstraight ends a distance suiiicient to permit the end of a tube to bepassed a sufficient distance through the opening in one of the drums tobring the oppositevend of the tube opposite the opening in thel otherdrum, after which said other end-may be made to enter said other drumand the tube brought to its final position in the boiler and in thecorrect position to be expanded into said opening.

- DAVID S. JACOBUS.V

drum to permit of the insertion of the oppo# site end of the tube in itsopening in the associated drum and its removal therefrom, the

. intermediate portions of the tubes being relatively large to rovide arelatively small gas flow area there tween.

2. A water tube boiler comprising two parallel cylindrical drumsA eachprovided with openings, afbankof tubes connecting said drums and havingcurved ends terminating in reduced end portions at each end which enterthe openings in said drums, the tubes plein spaced from each othertransversely of e of the bank, said tubes being unreduced throughout themajor. portion of their lengths, and reduced at their ends a distancethat will permit the end of a tube to be passed a sufficient distancethrough the openlng in one of the drums to bring the opposite end ofthe-tube opposite-the opening 1n the other drum, after which said otherend may be made to enter said other drum and the tube ank and from Vthefront tothe back brought to its linal position in the boiler andposition to be expanded into the major portion of their lengths, andre-4

